Swing check valve

Abstract

A swing check valve is disclosed, the swing check valve comprising a housing; a disc; and a sealing arrangement between the housing and disc. The sealing arrangement comprises a flexible disc seat; and a metallic body seat. The metallic body seat comprises an engagement surface for engaging the flexible disc seat, the engagement surface includes a raised portion for engaging the flexible disc. In an embodiment the metallic body seat comprises an engagement surface for engaging the disc seat, the engagement surface comprising a first portion for engaging a flexible elastomeric portion of the disc seat and a second portion for engaging a metallic portion of the disc seat after compressing the flexible elastomeric portion.

1 . A swing check valve, the swing check valve comprising:
 a housing;   a disc; and   a sealing arrangement between the housing and disc, the sealing arrangement comprising:
 a flexible disc seat; and 
 a metallic body seat; 
   wherein the metallic body seat comprises an engagement surface for engaging the flexible disc seat, the engagement surface comprising a raised portion for engaging the flexible disc seat.   
     
     
         2 . The swing check valve of  claim 1 , wherein the engagement surface of the metallic body seat is located radially-inward from a recessed portion of the engagement surface. 
     
     
         3 . The swing check valve of  claim 1 , wherein the engagement surface of the metallic body seat extends continuously around the body seat. 
     
     
         4 . The swing check valve of  claim 1 , wherein the metallic body seat is removable from the housing. 
     
     
         5 . The swing check valve of  claim 1 , wherein the engagement surface of the metallic body seat comprises a metallic o-ring structure. 
     
     
         6 . The swing check valve of  claim 1 , wherein the flexible disc seat comprises rubber. 
     
     
         7 . The swing check valve of  claim 1 , wherein the flexible disc seat is located within a seat cavity. 
     
     
         8 . The swing check valve of  claim 7 , wherein the seat cavity comprises a recess for receiving a deformed disc seat during sealing. 
     
     
         9 . The swing check valve of  claim 8 , wherein the seat cavity includes a recess for retaining the disc seat. 
     
     
         10 . The swing check valve of  claim 7 , wherein the flexible disc seat is held in place by a retaining ring. 
     
     
         11 . The swing check valve of  claim 1 , further comprising a hard stop on the disc configured for contact by the metallic body seat at higher pressures when the flexible disc seat compresses beyond the stopping point provided by the disc seat. 
     
     
         12 . A swing check valve, the swing check valve comprising:
 a housing;   a disc; and   a sealing arrangement between the housing and disc, the sealing arrangement comprising:
 a disc seat; and 
 a metallic body seat; 
   wherein the metallic body seat comprises an engagement surface for engaging the disc seat, the engagement surface comprising a first portion for engaging a flexible elastomeric portion of the disc seat and a second portion for engaging a metallic portion of the disc seat after compressing the flexible elastomeric portion.   
     
     
         13 . The swing check valve of  claim 12 , wherein the engagement surface of the metallic body seat extends continuously around the body seat. 
     
     
         14 . The swing check valve of  claim 12 , wherein the metallic body seat is removable from the housing. 
     
     
         15 . The swing check valve of  claim 12 , wherein the metallic body seat comprises a sealing element located between the seal ring and the housing. 
     
     
         16 . The swing check valve of  claim 12 , wherein the engagement surface of the metallic body seat comprises a metallic o-ring structure. 
     
     
         17 . The swing check valve of  claim 12 , wherein the flexible disc seat comprises rubber. 
     
     
         18 . The swing check valve of  claim 12 , wherein the flexible disc seat is located within a seat cavity. 
     
     
         19 . The swing check valve of  claim 18 , wherein the seat cavity comprises a recess for receiving a deformed disc seat during scaling. 
     
     
         20 . The swing check valve of  claim 18 , wherein the seat cavity includes a recess for retaining the disc seat.